Ishikawa Gasket Co., Ltd.

Yoshio Miyaoh

Susumu Inamura

Tsunekazu Udagawa

Yoshio Yamada

Kenji Yamada

Kisho Yasuda

Itsuo Ishikawa

Noriaki Akimoto

Katsuji Aoki

Takashi Okano

Minoru Nakaya

A metal gasket for sealing multiple cylinder bores includes one or more metal substrates, main sealing beads around each of the cylinder bores, and one or more sub-beads. The main sealing beads include meandering portions located in a sealing portion between the cylinder bores, and the sub-bead is provided between the meandering portions. By placing the sub-bead between the main bead meandering portions, the base portion of the meandering portion and the base portion of the sub-bead squeeze each other. As a result, the lower portion of the meandering portion can be prevented from slipping, and the surface pressure can be partially reinforced. The metal gasket provides an excellent seal in a location where surface pressure is often partially reduced.

Metal gasket

A cylinder head gasket for an internal combustion engine includes a first metal plate having first holes and first beads formed around the respective first holes, and a second metal plate disposed under the first metal plate and having a second bead extending toward the first metal plate. A distance between the first and second beads or a width of at least one of the first and second beads at a high heat load portion of the cylinder bore is formed to be greater than a distance between the first and second beads or a width of at least one of the first and second beads at a low heat load portion of the cylinder bore to thereby reduce a surface pressure at the high heat load portion.

Cylinder head gasket

In a cylinder head gasket, a base plate forming the gasket is formed of a first metallic material, and a grommet is provided around a hole for a cylinder bore and formed of a second metallic material different from the first metallic material. The grommet and the base plate are connected by welding. Accordingly, the grommet formed of the optimum material can be provided around the hole for the cylinder bore, and the base plate can be formed of the optimum material. Thus, the cylinder head gasket has a good sealing ability and excellent durability.

Cylinder head gasket with different materials

A cylinder head gasket is formed of a metal plate, a sealing bead formed in the metal plate around a liquid hole, and a peripheral bead formed in the metal plate to extend around a periphery of the metal plate. At least a part of the peripheral bead is set to have a surface pressure lower than that of the sealing bead when the gasket is tightened by that the height of the peripheral bead is lower than that of the sealing bead or the width of the peripheral bead is greater than that of the sealing bead. Thus, when the gasket is tightened, substantially uniform and optimum load share can be obtained on the peripheral bead and the sealing bead for the fluid hole.

Cylinder head gasket with peripheral bead

A cylinder head gasket is formed of a single metal base plate for sealing between a cylinder head and a cylinder block of an internal combustion engine. The cylinder head gasket has a primary sealing portion including a grommet or shim around a cylinder bore, and a secondary sealing portion outside the primary sealing portion. The secondary sealing portion is formed of a bead and a foamed coating layer coated on one side or both sides of the bead to cover at least a portion of the bead in a belt shape.

A cylinder head gasket for an internal combustion engine is formed by a first metal plate extending substantially throughout an entire area to be sealed and having a first hole corresponding to a hole of the engine, and second and third metal plates disposed to sandwich the first plate and having second and third holes formed in the respective second and third plates corresponding to the first hole. First and second beads are formed in the respective second and third plates to extend toward the first metal plate. A first resin coating is deposited on at least one side of the first metal plate at an inner portion relative to the first bead, and a second resin coating is deposited on at least one side of the first metal plate at an outer portion relative to the first bead without extending over an entire surface thereof. The second resin coating has a thickness at most equal to that of the first resin coating. The surface pressure around the hole can be adjusted precisely.

Cylinder head gasket with partial resin coatings

A metal cylinder head gasket is formed of a metal plate extending substantially throughout an entire area to be sealed. The gasket includes a plurality of first holes for cylinder bores, a plurality of second holes for bolts, a plurality of beads formed in the metal plate to surround the first holes, and a plurality of slits formed in the metal plate to partly surround the beads between the second holes except for an intermediate area between the first holes. Each slit has narrow and wide areas. The narrow area has a width narrower than that of the wide area to adjust compressibility of the bead to thereby securely seal around the first holes.

Metal cylinder head gasket with compressibility adjusting slits

A cylinder head gasket is formed of a metal plate, cylinder bore sealing devices formed on the metal plate for sealing around cylinder bores, and at least one water hole sealing device formed on the metal plate. The water hole sealing device has an inner sealing portion extending along and outside the cylinder bore sealing devices to have a space thereto and extending outside the water holes on a side of the cylinder bores, and an outer sealing portion situated outside the water holes and extending along the inner sealing portion. The inner and outer sealing portions surround a plurality of water holes therein, and continuously extend to join together to have at least one gas releasing portion between end portions of the water hole sealing device. Thus, even if the combustion gas leaks from the cylinder bores, the gas can be prevented from entering the water holes.

Cylinder head gasket with gas releasing portion

A metal laminate gasket for an internal combustion engine is formed of first, second and third metal plates laminated together. sealing devices are attached to the first metal plate, each having a curved portion for defining a cylinder bore, and a flange extending from the curved portion in a direction away from the cylinder bore. The second metal plate situated above the first metal plate has at least one notch between the cylinder bores, and the third metal plate situated above the second metal plate has an engaging portion between the cylinder bores. At least one holding portion is attached to the sealing device. The holding portion is located above the engaging portion to thereby allow the engaging portion to be located in the notch when the gasket is assembled. Thus, the engaging portion between the third holes is retained by the holding portion.

Metal cylinder head gasket with portion for holding intermediate area between cylinder bores

A metal gasket is formed of first, second and third metal plates laminated together. The first metal plate has a first hole, and the second metal plate is situated above the first metal plate and has a second hole. The second hole is greater than the first hole and has a second edge located above the first metal plate. A first bead is formed in at least one of the first and second metal plates to surround the first and second holes. The third metal plate includes a base portion situated above the second metal plate, a curved portion extending from the base portion and situated inside the first and second holes, and a flange extending from the curved portion and situated under the first metal plate. The flange has a third edge located between the first and second edges, so that high surface pressure areas are formed above the flange and the first bead with a low surface pressure area therebetween, by which the gasket can be securely sealed.

Metal gasket with different surface pressure portions

A metal laminate gasket for an internal combustion engine is formed of first, second and third metal plates. The first metal plate includes a base portion, a curved portion extending from the base portion to define a hole for a cylinder bore, and a flange extending from the curved portion and disposed under the base portion. The flange has a plurality of wide flange portions and narrow flange portions alternately arranged to each other such that the wide flange portions are located near bolt holes arranged around the cylinder bore to support high tightening pressures applied thereto. The second plate is situated under the base portion, and has a first bead formed around the cylinder bore and disposed between the base portion and the flange. The third plate is situated between the base portion and the second metal plate, and is located outside the flange. The tightening pressures by bolts are supported by the wide and narrow flange portions to securely seal around the cylinder bore.

Metal laminate gasket with wide and narrow flange portions

A metal laminate gasket of the invention is used for an internal combustion engine having a sealing hole and a plurality of bolt holes situated around the sealing hole. The gasket is formed of first and second metal plates having holes corresponding to the sealing hole and the bolt holes of the engine. The second metal plate includes a base portion, a curved portion extending from the base portion to define one hole therein and located inside one hole in the first plate, and a flange extending from the curved portion and disposed over the first plate. The flange has a plurality of wide flange portions and narrow flange portions alternately arranged to each other such that the wide flange portions are located near the bolt holes to support high tightening pressures applied thereto. A bead may be formed on one or both of the first and second plates outside the flange. The bead may have wide and narrow portions to provide equal surface pressures as a whole.

A metal gasket of the invention is used for a cylinder head gasket or a pipe connecting gasket. The gasket is basically formed of a single metal plate having a base portion extending substantially throughout an entire area to be sealed, and includes a bead protecting portion extending outwardly from the front surface and a sealing bead adjacent to the bead protecting portion. The bead protecting portion and the sealing bead are formed in the metal plate. The bead protecting portion has no substantial compressibility, but the sealing bead has a compressibility. Thus, when the metal plate is compressed, the bead protecting portion provides a surface pressure without substantial resiliency, and the sealing bead provides a surface pressure with resiliency and is protected from being completely compressed by the bead protecting portion. The gasket can be made thin.

Metal gasket with sealing bead and bead protecting portion

A gasket of the invention is formed of a gasket member extending substantially throughout an entire area to be sealed. The gasket member includes a base metal plate and at least one sealing member disposed on at least one of surfaces of the base metal plate. A sealing section and a pressure affecting portion are formed in the sealing member. The sealing section has a compressibility, while the pressure affecting portion has a height and compressibility less than those of the sealing section. When the gasket is tightened, the sealing section is compressed to securely seal around a hole to be sealed. The pressure affecting portion having less compressibility is formed near bolt holes, so that the gasket can be tightened easily without gradually decreasing its tightening pressure.

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Tokyo, Japan

Yoshio Miyaoh